What size Exhaust Piping?
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From: Louisville, Ky, United States
What size Exhaust Piping?
I plan on having my entire exhaust done in the next week or two on my 1989 Civic hatchback (STD), and i was wondering what is the biggest piping i should use? Right know i have the factory motor, but Plan on a B16 swap in the future. I plan on using a resonator to make the exhaust sound deeper, can someone recommend a resonator?
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From: South Korea
2.25" piping should be sufficient. I'm doing the same swap, but I'm going with 2.5" piping w/resonator and a 2.5" cat, 'cuz I will be building the motor later on, and I don't want to have to do a custom exhaust twice.
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From: cedar rapids, iowa, u.s
Re: (civic_jdm)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civic_jdm »</TD></TR><TR><TD CLASS="quote">2.5 inch is the best for na applications 
</TD></TR></TABLE>
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</TD></TR></TABLE>^
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From: Ft. Hood
Re: (accord218)
Sigh...time to break out the reference chart -
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Micheal D from Team-Integra.net »</TD></TR><TR><TD CLASS="quote"> 1. Diameter is King:
The most important factor about an exhaust is the B pipe and inlet muffler tube diameters needed for you flywheel HP goal. These outer diameter sized are suggested by SMPSP. The suggested diameters assumes that the thickness of the exhaust tube is 16 guage steel:
Most Integra (Or in our case Civic) owners have a 1.8L (Again, 1.6L for us) engine with "bolt-ons only." You may want to look for a 2 1/4 in. diameter exhaust to start off with. If you begin to think about big lift-long duration cams, bigger 2.5 in collector headers, headwork, or boring out to get more displacement, then go up to the next levels in diameter as determined by your power goal.
2-1/4" up to 210HP @ the flywhel (about 18--185 whp)
2-3/8" (60mm) up to 235HP@ the flywheel (about 200-207 whp)
2-1/2" up to 265HP @ the flywheel (about 225-235 whp)
2-3/4" up to 325HP @ the flywheel (abour 275-285 whp)
3" big for big HP (Forced Induction: > 275 whp)
The general rule here for sizing an exhaust is: for every 60 flywheel hp, you need one square inch of exhaust cross-sectional area (i.e. 60hp/square in.), in order to achieve the exhast flow speed required for adequate exhaust gas scavenging out of the cylinder.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Micheal D from Team-Integra.net »</TD></TR><TR><TD CLASS="quote"> 1. Diameter is King:
The most important factor about an exhaust is the B pipe and inlet muffler tube diameters needed for you flywheel HP goal. These outer diameter sized are suggested by SMPSP. The suggested diameters assumes that the thickness of the exhaust tube is 16 guage steel:
Most Integra (Or in our case Civic) owners have a 1.8L (Again, 1.6L for us) engine with "bolt-ons only." You may want to look for a 2 1/4 in. diameter exhaust to start off with. If you begin to think about big lift-long duration cams, bigger 2.5 in collector headers, headwork, or boring out to get more displacement, then go up to the next levels in diameter as determined by your power goal.
2-1/4" up to 210HP @ the flywhel (about 18--185 whp)
2-3/8" (60mm) up to 235HP@ the flywheel (about 200-207 whp)
2-1/2" up to 265HP @ the flywheel (about 225-235 whp)
2-3/4" up to 325HP @ the flywheel (abour 275-285 whp)
3" big for big HP (Forced Induction: > 275 whp)
The general rule here for sizing an exhaust is: for every 60 flywheel hp, you need one square inch of exhaust cross-sectional area (i.e. 60hp/square in.), in order to achieve the exhast flow speed required for adequate exhaust gas scavenging out of the cylinder.</TD></TR></TABLE>
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